DERECK CHISORA has cranked up the tension ahead of his grudge fight with David Haye by vowing to ‘f*** him up’.

With bad blood flowing between the feuding London heavyweights, who meet at Upton Park on July 14, Chisora yesterday took the trash talk to a new low.

The pair were separated by a metal fence as they swapped insults ahead of a clash which has already sold 30,000 tickets.

The British Boxing Board of Control fiercely oppose the bout, with neither ­boxer holding a British fight licence, after the pair brawled at a post-fight press ­conference in Germany last February.

The fight will be staged by the Luxembourg Boxing Federation. Promoter Frank Warren is threatening legal action against the BBBC, while the European Boxing ­Union is threatening to expel the LBF.

“David talks a lot but I just hope David is ready to go where I want to go and there are no excuses from him after the fight, like he injured his toe,” said Chisora.

“Right now I’m behaving myself and ­after the fight I will try to behave myself.

“But in the ring during the fight I won’t be behaving myself, I will be like an ­animal and I’m going to rock it out. We are two fighters and this is like the people in Libya saying Gaddafi should go. The fight has to happen.

“I want my opponent to come out of the ring healthy and operate in the same way, as I hope I do. But on the night I’m going to look for this sucker in the ring and f*** him up.”

Haye dismissed Chisora’s threats and claims he has the public’s backing.

The former heavyweight and cruiserweight world champion also called for a strong referee on fight night.

He said: “I’ve always been a model professional in the ring, but he hasn’t and we are going to need a strong referee who doesn’t stand for any fractures of the laws.

“He will find out on the night there’s a reason why I’ve got a 90% knockout ratio and it doesn’t come from running around the ring.

“I don’t just want to win this fight, it’s how I dispose of him that matters.

“If you stripped all the fat off Dereck Chisora he would still weigh the same. Everyone I speak to just wants to see him punished.”

Three British boxers – Frankie Gavin, Mathew Hall and Liam Walsh – will be on the undercard despite the British Board threatening to ban anyone on the bill.